I wanted to get back into DOU and figured Teambuilding Competition is as good an inspiration as ever! I started with Charizard Y, a cool Pokemon. My immediate thought was "damn Jirachi would be nice here" because it checks both Psychic spam and Mega Salamence (which is exactly 100% of the meta from what I've picked up) in a single slot, while also doing the Jirachi things we all know and (I) love. For my third Pokemon, I wanted something else that can stand on its own and be a threat, and I decided to go with Tapu Fini. It's bulky, not hard to set up, reasonably strong, and improves my team's matchup as a whole against the other island guardians. CM + Sub almost won San Jose in VGC and I didn't really know what else to run, but the speed outruns Jolly Azumarill (which is a benchmark I often tried to hit on many Pokemon last gen). Landorus-T is just an overall useful Pokemon, and the addition of Groundium Z has solved some of its biggest problems. I attempted to go for a bulkier spread rather than running the classic Scarf (although I hear AV is meta?), with enough power to OHKO 0/4 Tapu Lele at -1. Hidden Power Ice is a guaranteed 2HKO on 0/0 Mega Salamence even with an Adamant nature and bulky versions are probably walled by Jirachi. Venusaur exists as a failsafe, being the fastest member of the team and having strong coverage on big meta threats, although I'm still a little wary of it because of its anti-synergy with Zard Y (depending on the opponent, Zard Y and Venusaur would be used at opposite points in the game in a perfect world, but Venu is pretty dependent on Zard). I added Celesteela in the last slot because I didn't know what else to run and because unhelpful user
Checkmater stopped responding after I said I didn't want to run Trick Room.